FORT UNION OF CRAZY MOUNTAIN FIELD, MONT. 57 



mate) place the plants near the top of the Bear. They are said to be 

 from sec. 29, T. 6 N., R. 16 E., a section that is mainly on the Bear 

 but includes a small area of No. 1. The identifications are: 



Salix sp. Aralia notata. 



Populus aynhlyrhyncha. Leguminosiies arachioides. 



Populus cuneata. Vitis xantholithensis. 



Populus genetrix. Credneria daturaefolia. 



Populus daphnogenoides. Phyllites cupanoides. 



Populus sp. Carpites sp. 



These are all common Fort Union species. Knowlton has also re- 

 ported them all as Lance (e. g., Knowlton, 1919), but on examining the 

 evidence it is found that Vitis (or Ampelopsis) xantholithensis, Cred- 

 neria daturaefolia, and Phyllites (or Pterospermites) cupanoides are 

 true Fort Union species reported in the Lance only on the strength 

 of this occurrence, and that there is also some question as to whether 

 Aralia notata really occurs in the Cretaceous, whereas it is abundantly 

 characteristic of the Fort Union. '^ In short, this is a Fort Union 

 flora, which would be expected since it is probably from the Bear, 

 w^hich may well be Paleocene or even properly Fort Union, or possibly 

 from the Lebo, which everyone now agrees to be Fort Union. 



Other small collections more definitely from the Bear and older 

 than any of the known mammals of this field are mentioned above. 



A collection surelv from the Lebo, "close under the massive gray 

 sandstone of the Fort Union" (i. e., the base of the No. 3 beds), in 

 "Sec. 15, T. 6 N., R. 15 E." (actually sec. 22, as later surveys have 

 shown; sec. 15 includes only the very base of the Lebo), was made by 

 Campbell, Stanton, Stone, and Calvert, and identified by Knowlton as 

 follows (in Stone and Calvert, 1910, p. 755): 



Platanus haydenii. Sapindus grandifoliolus. 



Populus cuneata. Grewia obovata. 



Populus amhlyrhyncha. Greuiopsis platanifolia. 



These are all Fort Union species, and all occur in the Glendive 

 region. The majority also occur in the Lance but are certainly in 

 the Fort Union in this section. 



Knowlton (1902) described a small flora collected by W. H. Weed 

 from "the sandstone series above the bend of the Sweet Grass, west 

 of Porcupine Butte, Montana." This locality is in this field, at the 

 extreme western edge of the mapped area, at a high horizon, far above 

 any identified mam.mals. The following species were recorded: Glyp- 

 tostrobus europaeus,^^ Onoclea sensibilis fossilis, Aralia Inotata, and 

 Tilia iveedii. The last has not been recorded elsewhere, but the 

 others are Fort Union (and questionably earlier) species, and Knowl- 



15 This incident casts further doubt on the supposed community of the Lance and Fort Union floras, for 

 there are many other areas where beds probably or surely Paleocene and definitely post-Hell Creek have 

 been arbitrarily called "Lance." 



'9 G. e. ungeri In the original list, but later emended by Knowlton to the form here given. 



